Introduce kernel-efi-warnings

Hi Matt,

Please find this pull request for your consideration. Essentially, all it does is introduce a simple script to analyze the dmesg buffer to look for messages issued by the kernel that might indicate it found a UEFI firmware bug.

The script is intended to be expanded to include other warnings that the kernel may issue in the future. Also, it could be a good example on how messages from bootloaders could be collected.

Also, it includes a parser for the LuvOS test manager as well as the needed bitbake recipes.

Thanks and BR,
Ricardo